Insights into the Effect of Confinement on Swirling Flow by PIV

Tao Liu, Chi Zhang, Xin Xue, Shun Zheng () and Muwei Yao
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Tao Liu: National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics, Research Institute of Aero-Engine, Beihang University, Beijing 100191, China
Chi Zhang: National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics, Research Institute of Aero-Engine, Beihang University, Beijing 100191, China
Xin Xue: National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics, Research Institute of Aero-Engine, Beihang University, Beijing 100191, China
Shun Zheng: Aero Engine Corporation of China Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, China
Muwei Yao: Aero Engine Corporation of China Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, China

Energies, 2025, vol. 18, issue 19, 1-13

Abstract: Confinement with a rectangular cross-section is commonly used to simulate the role of a swirl combustor, yet its effect on swirling flows remains poorly understood. This study investigates the influence of confinement on the isothermal flow field of a counter-rotating swirler. A particle image velocimetry (PIV) system was employed to measure the swirling flow field under varying confinement ratios at an air pressure drop equivalent to 3% of atmospheric pressure. The results reveal two distinct flow patterns, delineated by a critical confinement ratio of approximately 8.92. Detailed analyses of the velocity components, contour distributions, and Reynolds shear stresses were conducted. The two flow patterns are attributed to the wall attachment effect and swirling intensity, respectively. Furthermore, the results confirm that the swirling flow field is primarily governed by the confinement ratio.

Keywords: confinement ratio; particle image velocimetry (PIV); swirling flow field; central recirculation zone (CRZ) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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